Design and synthesis of highly selective fluorine ion probes become particularly important owing to the specific role of fluorine ion in chemical and biomedical progresses. As a new-type of fluorescent material, conjugated polymers with unique photometric properties have been widely researched by scientists in the field of the fluorescence sensors. In this study, the polymer PBTPV-OSi containing benzothiazole moiety is synthesized via palladium-catalyzed Heck coupling reaction. This polymer not only exhibits good solubility in organic solvents but also shows high selectivity for fluorine ion detection in comparison to other anions. Upon addition of F− to PBTPV-OSi solution, Si–O cleavage of PBTPV-OSi leads to the fluorescence quenching of the polymer in tetrahydrofuran dramatically, and the detection limit is 8 × 10−6 mol/L. Moreover, besides detecting fluorine ion from organic phase, the probe can also effectively detect potassium fluoride from inorganic phase. More importantly, a naked-eye detectable chromogenic and fluorogenic dual response to fluorine ion (F−) can be visibly noted and the detection process of fluorine ion is relatively fast.

中文翻译：

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基于共轭聚合物的 2-(benzo[d]thiazol-2-yl)phenol：基于 Si-O 键裂解反应的 F-的高选择性比色荧光化学传感器

由于氟离子在化学和生物医学进展中的特殊作用，高选择性氟离子探针的设计和合成变得尤为重要。作为一种新型荧光材料，具有独特光度特性的共轭聚合物已被荧光传感器领域的科学家们广泛研究。在这项研究中，通过钯催化的 Heck 偶联反应合成了含有苯并噻唑部分的聚合物 PBTPV-OSi。这种聚合物不仅在有机溶剂中表现出良好的溶解性，而且与其他阴离子相比，对氟离子的检测具有高选择性。在 PBTPV-OSi 溶液中加入 F− 后，PBPTV-OSi 的 Si-O 裂解导致聚合物在四氢呋喃中的荧光猝灭，检测限为 8 × 10-6 mol/L。而且，该探针除检测有机相中的氟离子外，还可有效检测无机相中的氟化钾。更重要的是，肉眼可检测到对氟离子 (F-) 的显色和荧光双重响应，并且氟离子的检测过程相对较快。